University of Oulu

Hewen Zheng, Qiannan Li, Yeqing Ling, Mamdouh Omran, Lei Gao, Jin Chen, Guo Chen, Research on microwave drying technology in the procedure of preparation of V2O5 from ammonium polyvanadate (APV), Advanced Powder Technology, Volume 32, Issue 7, 2021, Pages 2530-2542, ISSN 0921-8831,

Research on microwave drying technology in the procedure of preparation of V₂O₅ from ammonium polyvanadate (APV)

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Author: Zheng, Hewen1,2; Li, Qiannan1,2; Ling, Yeqing1,2;
Organizations: 1Kunming Key Laboratory of Energy Materials Chemistry, Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, Yunnan Minzu University, Kunming 650500, PR China
2Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming University of Science and Technology, Kunming 650500, PR China
3Faculty of Technology, University of Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 2.5 MB)
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Language: English
Published: Elsevier, 2021
Publish Date: 2021-06-15


High-quality vanadium pentoxide powder is an important product of the vanadium industry and was usually prepared from ammonium polyvanadate (APV) using a roasting process combined with a drying pretreatment. Conventional hot air drying is usually used for the drying of APV, the heat transfer of which is from outside to inside thus limited the efficiency of the drying pretreatment. In the present paper, microwave heating was applied as an alternative heating method for the drying of APV because of its advantages including selective heating, high heating efficiency, low energy consumption, and green environmental protection. An experimental comparison between hot air drying and microwave drying is provided, and the results show that microwave drying is more energy-saving and faster. The drying characteristics of APV under the irradiation of microwave energy were investigated. The influences of factors including microwave power, material quality, and initial moisture content on microwave drying were studied. The results show that the microwave power, initial moisture content, and initial mass are positively proportional to the microwave drying efficiency of APV. Additionally, the Page model was robust in describing the kinetics of microwave drying and hot air drying of APV. This study provides fundamental knowledge on the microwave drying process and provides the trial for the industrial applications of microwave heating on the preparation of V₂O₅.

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Series: Advanced powder technology
ISSN: 0921-8831
ISSN-E: 1568-5527
ISSN-L: 0921-8831
Volume: 32
Issue: 7
Pages: 2530 - 2542
DOI: 10.1016/j.apt.2021.05.027
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: Financial supports from the National Natural Science Foundation of China (No: U1802255, 51404114 and 51504110), the National Key R&D Program of China (2018YFC1900500), the Key Projects in the National Science & Technology Pillar Program during the Twelfth Five-year Plan Period (No. 2015BAB17B00), and Innovative Research Team (in Science and Technology) in University of Yunnan Province were sincerely acknowledged.
Copyright information: © 2021 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. This manuscript version is made available under the CC-BY-NC-ND 4.0 license